These Two Have Appeared In The Same Thingさんのイラストまとめ

Marie (Splatoon) and SpongeBob SquarePants appeared in Splatoon together

Kirby and Hatsune Miku (Vocaloid) appeared in Taiko no Tatsujin: Drum 'n' Fun! together

Isabella Garcia-Shapiro (Phineas and Ferb) and Red Skull (Marvel Comics) appeared in Phineas and Ferb: Mission Marvel together

Sol Badguy (Guilty Gear) and Hatsune Miku appeared in Brave Frontier together

Akatsuki (Akatsuki Blitzkampf) and Sion Eltnam Altasia (Melty Blood) appeared in UNDER NIGHT IN-BIRTH together

Hatsune Miku and Yu Narukami (Persona) appeared in Persona 4: Dancing All Night together

Sohpie (Tales of Graces) and Nico Yazawa (Love Live) appeared in Granblue Fantasy together

Optimus Prime (Transformers) and Eva 01 (Neon Genesis Evangelion) appeared in Transformers x Evagellion together

Ariana Grande and Fei Fong Wong (Xenogears) appeared in Final Fantasy: Brave Exvius together

Samurai Jack and Porky Pig appeared in a Cartoon Network bumper together